Overexploitation and contamination of shared groundwater resources : management, (bio)technological, and political approaches to avoid conflicts : [proceedings of the NATO Advanced Study Institute on Overexploitation and Contamination of Shared Groundwater Resources: Management, (Bio)Technological, and Political Approaches to Avoid Conflicts, Varna, Bulgaria, 1-12 October 2006] / edited by Christophe J.G. Darnault

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